Some 2D and all OGL apps just will not use the high performance chip. The laptop was designed that way. The solution is to change the graphics/display options in the bios to 'fixed'/'static',etc from the default 'dynamic'/'switchable'. Not all laptops have this option...all high end laptops do. If this option is not available, check with the laptop manufacturer for a bios update...

Trust me that Intel driver is not up to date (I assume you checked with windows update?).If the driver is correct,it should show you the actual name of the gpu (in your case,hd4400) not a generic name,it shows like that only on Intel Nehalem IGPs.

I tested using Intel(R) Driver Update Utility 2.8.1 and it found update for Bluetooth and Wifi which I installed. No other updates are shown.

I spent last 1-2 hours testing using different utilities and found SupportAssist tool on Dell website. Installed and performed all test which Passed. Performed AMD Graphic card device specific test which also passed. During test I captured the following screens.

Surprisingly none of the 2 utilities showed any GPU load even though the laptop was heated a lot during test.

1 other thing I noticed

When I launch PotPlayer it shows Max Performance and then changes to Power saving mode

I suggest you go to Windows Update and run it. Install all 'critical', 'recommended', and relevant 'optional' (no language packs, etc) updates. If you do not get the message "There are no more updates available", then keep on installing them until you get that message. Then install the AMD drivers.

Setting Handbrake on the GPU does not affect its performance (other than,maybe, rendering the UI with the GPU).If you want to take advantage of hardware accelerated video conversion you need an OpenCL capable converter (I think Handbrake has this but it is not used extensively).Handbrake as far as I know uses Quicksync at best.

Do not force DWM on the dedicated GPU,it is the desktop compositor and it doesnt like to switch between gpus.The Intel driver update tool does not show updates for systems altered by the OEMs.I actively avoid it on laptops.Using GPUz,please tell me what driver version it reports for the Intel GPU.Also,could you try an EFI boot for another os?Switchable graphics/Nvidia Optimus are known to have problems on „legacy” systems (that is,newer configs on older operating systems).